Katharine McPhee caught kissing 'Smash' director

Paparazzi caught former Smash star Katharine McPhee in the midst of a steamy makeout session -- with a man who's not her husband.

McPhee and Smash director Michael Morris seemed pretty cozy while out on a date last weekend, where they held hands and kissed in a parking lot.

The issue is, he's still married to actress Mary McCormack and McPhee is still hitched to her husband of five years, Nick Cokas.

Naturally, the rumor mill is swirling in the aftermath of the photos surfacing on TMZ, including buzz that McPhee and Cokas separated six months ago and unconfirmed reports that McCormack has kicked Morris out of their house.